New Zealand on Saturday marked the second anniversary of one of its most traumatic days, when 51 worshippers were killed at two Christchurch mosques by a white supremacist gunman.

Several hundred people gathered at the Christchurch Arena for the remembrance service, which was also live-streamed.

A similar service planned for last year was cancelled at short notice due to the sudden spread of the coronavirus.

Kiran Munir, whose husband Haroon Mahmood was killed in the attacks, told the crowd she had lost the love of her life and her soulmate.

She said her husband was a loving father of their two children. He had just finished a doctoral degree and was looking forward to his graduation ceremony when she last saw his smiling face.

“Little did I know that the next time I would see him the body and soul would not be together,” she said.

“Little did I know that the darkest day in New Zealand’s history had dawned. That day my heart broke into a thousand pieces, just like the hearts of the 50 other families.”

Temel Atacocugu, who survived being shot nine times during the attack on the Al Noor mosque, said the slaughter was caused by racism and ignorance.

“They were attacks on all of humanity,” he said.

He said the survivors would never be able to erase the pain in their hearts and would never be the same.

“However, the future is in our hands,” he said. “We will go on and we will be positive together.”

In the March 15, 2019, attacks, Australian Brenton Tarrant killed 44 people at the Al Noor mosque during Friday prayers before driving to the Linwood mosque, where he killed seven more.

Last year Tarrant, 30, pleaded guilty to 51 counts of murder, 40 counts of attempted murder and one count of terrorism, He was sentenced to life in prison without the possibility of parole.

After the attacks, New Zealand quickly passed new laws banning the deadliest types of semiautomatic weapons.

During the service, the names of each of the 51 people who were killed were read out. The efforts of first responders, including police and medics, were also acknowledged.

Prime Minister Jacinda Ardern told the crowd that when preparing her speech, she had been at a loss for what to say because words would never change what happened.

“But while words cannot perform miracles, they do have the power to heal,” she said.

The Muslim community had experienced hatred and racism even before the attacks, she said, and words should be used for change.

“There will be an unquestionable legacy from March 15,” Ms Ardern said.

“Much of it will be heartbreaking. But it is never too early or too late for the legacy to be a more inclusive nation.”

Read more: William’s emotional speech to Christchurch mosque survivors

A comprehensive report into the 2019 Christchurch mosque shootings in which 51 Muslim worshippers died sheds new light on how the gunman was able to elude detection by authorities as he planned his attack.

The nearly 800-page Royal Commission of Inquiry report released on Tuesday shows the attacker, Brenton Tarrant, kept a low profile and told nobody of his plans.

It concludes that despite the shortcomings of various agencies, there were no clear signs the attack was imminent — aside from the manifesto Tarrant sent out just eight minutes before he began shooting, which came too late for agencies to respond.

But the report does detail failings in the police system for vetting gun licenses, and says New Zealand’s intelligence agencies were focused on the threat posed by Islamic extremism rather than white supremacists.

Among 44 recommendations, the report says the government should establish a new national intelligence agency.

New Zealand currently has one intelligence agency that focuses on domestic threats and one that focuses on international threats. Often those agencies are focused on immediate events like keeping visiting dignitaries safe. The report recommends establishing a new, well-financed intelligence and security agency that is more strategic in nature and can focus on emerging threats and developing a counter-terrorism strategy.

New Zealand Prime Minister Jacinda Ardern said the government had agreed to implement all of the recommendations and apologized for agency shortcomings.

Tarrant, who is Australian, was sentenced in August to life in prison without the possibility of parole after pleading guilty to 92 counts of terrorism, murder and attempted murder.

The report details the extensive world travels of Tarrant but also shows he had almost no meaningful interactions with people in New Zealand because he was introverted and did not work.

As a child, Tarrant had unsupervised access to the internet and became interested in video games from the age of six or seven, the report says. He began expressing racist ideas from a young age and told his mother he started using the 4chan internet forum from age 14.

He put on a lot of weight as a teenager before starting to exercise compulsively at gyms and going on a diet, losing about 110 pounds. His father Rodney was diagnosed with lung cancer caused by exposure to asbestos and in 2010 killed himself at home, leaving an inheritance of 457,000 Australian dollars (£253,000) to Tarrant.

The gunman worked for about three years as a personal trainer at a gym in the Australian town of Grafton, but stopped working after an injury and then used his inheritance to live and travel to dozens of countries.

He moved to New Zealand in 2017 and focused on planning for his attack. The report said he only had superficial interactions with people at a gym and the rifle club where he practiced rapid-fire shooting. Yet when needed, Tarrant could present himself to others in a way that did not arouse suspicion.

Tarrant told investigators that although he frequented extreme right-wing discussion boards on websites like 4chan and 8chan, he found YouTube a far more significant source of information and inspiration.

Ms Ardern said she planned to speak to leaders at YouTube “directly” about how the gunman had become inspired by videos on the site.

As part of the process for acquiring a gun licence, Tarrant was required to provide to police the names of two referees who could speak to his good character. He gave them the name of a friend he knew mostly online from gaming together, along with that friend’s father. Vetting officers interviewed Tarrant and the referees, and recommended he be given his license.

Police Commissioner Andrew Coster said the force “could have done more to consider whether the two referees knew the individual well enough to serve as referees”.

The report also found the New Zealand Security Intelligence Service, the domestic spying agency, had chosen to concentrate scarce counter-terrorism resources on the threat of Islamist extremist terrorism inspired by groups like Islamic State at the expense of other threats.

Despite the shortcomings of various agencies, the report concludes, there was no plausible way Tarrant’s plans could been detected “except by chance”.